Lubricator for percussive tools



Jan- 2, 1951 o. J. scHoRr-:R

LUBRIcAT'oR FOR PERcus'sIvE TooLs Fild May k.24, 1947 OTTO "3'. SCHORER IN VEN TOR.

Patented `an. 2, 1951 on, Harrison;- ware orthairipi'.'oml Mass.,f .assigner ump and' Machinery orpo- N. .1., aycprporationofz Dela- ApplicationMay 24, 19441, SerialNozdD'ZZn' 1 claim. (ori-84455) This invention relates to percussive tools and,

more particularly, to an oiling or lubricating structure for pressure fluid actuated tie tampers, clay spades, paving breaxers and the like.

An` object of the present invention is to provide a simple, compact lubricating system and apparatus for percussive tools which will supply the necessary lubricating oil to the various workin-g parts of the tool, utilizing the pulsations in the operating pressure iiuid during operation of the tool to deiiver the lubricating oil to the working parts of the tool.

Another object of the present invention is to utilize the handle or hand grip of the tool as a reservoir for the lubricating oil and to provide means to maintain an air pocket in the reservoir to insure discharge of oil upon each lower pressure pulsation in the pressure fluid during operation of the tool, which oil is subsequently delivered to the working parts or the tool during the high pressure pulsations.

With these and other obJects in view, as may appear from the accompanying specification, the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings, showing a lubricator for percussive tools of a preferred form embodying the invention, and the features forming the invention will be speciically pointed out in the claims.

In the drawings:

Figure l is a longitudinal section through a percussive tool embodying the lubricating structure.

Figure 2 is a cross section taken on the line 2-2 of Figure 1.

Referring more particularly to the drawings, Figure l shows a longitudinal section through a pressure fluid operated tie tamper but it is to be understood that the invention may be applied to clay spades, paving breakers or similar percussive tools without departing from the spirit of the present invention.

The percussive tool includes the body cylinder I in which a hammer piston 2 is reciprocated by air under pressure and the control of the air under pressure to the tool is provided by a valve 3 which is held open by cam action on rotary plug 4 operated by a manual handle 5. The air under pressure enters the chamber 6 through the air inlet 'I and passes, when the valve 3 is off its seat into the annular chamber I from which it is delivered through the passageway 8 into the cylinder I for reciprocating 2 theaha'r'r''reitpi'stoif. The hammer piston 2 is reciprocated in the usual manner of tools of this type and the operating air under pressure exhausts on the forward stroke of the piston 2 through the exhaust 9, thus during operation of the percussive tool there will be low pulsations in the incoming operating pressure fluid during the exhaust period and high pressure pulsations during the power stroke of the piston 2.

The head I of the tool which is attached to the cylinder has a laterally extending handle II thereon which is gripped by one hand of the operator during operation and the hand grip I2 of the handle structure II is provided with a recess I3 therein forming a reservoir for lubricating oil. The recess i3 opens out through one end of the hand grip I2 to permit lling of the reservoir. The open end of the reservoir I3 is closed by a closure plug I4 which threads into the handle as shown at I5. The closure plug I4 has a recess therein extending inwardly from its inner end so that there will be, at all times, an air space in the reservoir I3 regardless of the quantity of oil in the reservoir due to the fact that when the plug I4 is threaded into the threaded opening I5 a volume of air is entrapped within the recess I6'.

rhe end of the reservoir I3 opposite the end in which the plug I4 is mounted is connected by a small restricted passage I6 with a chamber I1 in which is positioned felt packing I9 o-r analogous material which will retard the free iiow of lubricating oil into or through the chamber I1. The chamber Il is connected by a passage I8 with the inlet 1 for air under pressure. During the low pulsation periods of the air pressure in the tool, while it is operating, the pressure of the air entrapped in the reservoir will force oil to flow from the reservoir through the restricted passage I6 and felt packing in the chamber Il through the passage I8 into the air inlet passage 'I and during the inlet or high pulsation periods of the pressure air this lubricating oil will pass with the inflowing air into the chamber 6, annular chamber 'i' and through the passage 8 thereby lubrcating the working parts of the tool.

It will be understood that the invention is not to be limited to the speciic construction or arrangement of parts shown, but that they may be widely modified within the invention dened by the claim.

What is claimed is:

In a lubricator for percussive tools having a handle and a pressure .fluid inlet passage to alternately deliver high and low pressure for operation of the tool, a lubricant reservoir formed in said handle, a lling opening at one end of said reservoir and opening out through said handle. a conduit communicating with said pressure fluid inlet passage, a chamber connected to the end of said conduit and adjacent the lubricant reservoir, means for restricting ow of pressure uid out of said reservoir including, a restricted passage connecting said reservoir and said chamber to allow pressure fluid to pass into and out of said reservoir, a porous pad carried by said chamber, and a recessed closure plug in said lling opening to provide an air pocket in the reservoir regardless of the quantity of oil whereby during the low pressure pulsation of the pressure uid high pressure uid prevented from escaping by the restricted passage will force oil to ow from said oil reservoir to said inlet passage.

OTI'O J. SCHORER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 866,921 Duntley Sept. 24, 1907 1,109,222 Hansen Sept. 2, 1914 1,183,275 Clark May 16, 1916 1,597,412 Lear Aug. 24, 1926 1,614,130 Jimerson Jan. 11, 1927 1,852,724 Pearson Apr. 5, 1932 1,884,652 Garten Oct. 25, 1932 1,923,797 Richardson Aug. 22, 1933 2,001,717 Garten May 2l, 1935 2,075,576 Feucht Mar. 30, 1937 

